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Static:Routing information to destinations are computed in advance and are loaded into routers during time of initialization and these set values are used.

Dynamic: Routers discover this information themselves and share this with other routers. Change in routing decisions are based on estimates of current changes in network topology or traffic. This is done based on information from adjacent routers or all routers.

Dynamic routing protocols are built around an algorithm and they fall into two classes based on the methodology of the algorithms.

Obtaining closed form expressions for Time and communication complexity is impossiblebecause in a dynamic environment , timing and link cost changes occur in complex patterns which are often determined by traffic on the network.